One more hint, i expect you know about it, but i have to note it anyway, as i watch a lot of documentaries about uboats and read some books about aces...
The best depth to not be heard by DD's for sub was always near surface. Hydrophones and Asdic are able to hear most effectively if you are deep.
Great strategy in convoy attacks was sneaking in periscope depth because DDs was unable to hear anything so closely to surface.
In TWOS right now you are always much better heard near of surface (with exception if you are fully emerged, than you are not heard at all)
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